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Note 13 - Pension and Postretirement Benefits (Tables)
9 Months Ended
Sep. 30, 2023
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
  

Pension Plan and SERP

  

Postretirement Plan

 
  

For the Three Months Ended September 30,

 
  

2023

  

2022

  

2023

  

2022

 

Interest cost

 $4.4  $2.5  $  $ 

Expected return on plan assets

  (6.0)  (4.6)      

Amortization of prior service cost

  0.1          

Amortization of net actuarial loss

  1.2   0.9       

Net periodic (benefit) cost

 $(0.3) $(1.2) $  $ 

Employer contributions, net

 $0.2  $0.2  $0.2  $0.4 
  

Pension Plan and SERP

  

Postretirement Plan

 
  

For the Nine Months Ended September 30,

 
  

2023

  

2022

  

2023

  

2022

 

Interest cost

 $13.1  $8.8  $  $0.2 

Expected return on plan assets

  (18.2)  (20.4)     (0.2)

Amortization of prior service cost

  0.2   0.1       

Amortization of net actuarial loss

  3.9   2.1      0.2 

Net periodic (benefit) cost

 $(1.0) $(9.4) $  $0.2 

Employer contributions, net

 $1.5  $0.6  $1.0  $1.1